Jack and Lola-divorce

Jack and Lola are divorcing. They are arguing on court who should get the child.The Judge:Lola, why do you think that you should get the child?Lola: Well, Your Honor I was carrying it for nine months I was looking after it when it was born I am the mother I absolutuely deserved it.The Judge: What about you, Jack? What do you think?Jack: Your honor, when you put a coin in to the coffee machine and when the coffee gets out, whose coffee is it? The Machine's or the one who put the coin inside?